<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    const a = {
      name: 'jal'
    }
    Object.defineProperty(a, 'name', {
      get() {
        return a.name
      },
      set(value) {
        console.log(value)
      }
    })
    a.name = '111'
    console.log(a.name)
  </script>
</body>
</html>